Temperatures in December
It's cool in December in Cornwall with an average temperature of 11°C. Temperatures this month range from a low of 10°C to a high of 12°C. At night, you can expect temperatures between 6°C and 10°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Cornwall in December. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of December
The month of December starts in Cornwall with cold temperatures, averaging around 11°C during the day and nights close to 7°C. You can expect regular precipitation, but there’s also a chance for some sunny days in the first days of the month.
Mid-December
By mid-December, the average daytime temperature rises to around 12°C, with nights close to 8°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of December
By the end of December, the average daytime temperature in Cornwall will be around 12°C, with nights close to 8°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
Discover cheap holidays to Cornwall 
Precipitation in December
In December, there is an average of 126 mm of precipitation, spread over 20 days. The wind speed is around 5 Bft, mostly coming from the Southwest.
The average precipitation chance this month is 63% per day. Though that seems frequent, the weather’s variable. There are also a few days with lower precipitation chances.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in December for Cornwall. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Cornwall in December |
London | ||
|---|---|---|---|
 Average Temperature |
11°C | 9°C | |
 High Temp |
12°C | 11°C | |
| Low Temp |
10°C | 8°C | |
 Total Precipitation |
126 mm | 67 mm | |
| Rainy Days |
20 days | 10 days | |
November
UV index
The UV index is a maximum of 2 this month. That's a low value on the intensity scale of 1 to 11. The risk of sunburn is minimal at this time.
Is December a good time to visit Cornwall?
After some sun? Then December isn’t the best time to be in Cornwall. There’s too much chance of rain this month.
Temperature records for Cornwall in December
With 15°C, Cornwall hit the highest temperature in the last 10 years in December 2015. The lowest daytime temperature in this month was 3°C in 2022. The extreme night temperatures ranged from a low of -3°C to a high of 13°C.
Check out the climate of Cornwall for all months and discover the best travel time
Curious about the climate in other parts of England? Check out the weather and climate in places like London, Edinburgh, Devon, or have a look at other destinations in England.
Plan your next holiday
Don’t miss the best holiday deals for Cornwall and see what our partners have for you.
Daily Temperature in December in Cornwall
This chart shows the average daily temperatures, both day and night, for each day in December in Cornwall, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in December in Cornwall
The chart below shows the average daily precipitation in December for Cornwall, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for December, you can expect around 20 days of rain in Cornwall.
Daily UV Index in December in Cornwall
This chart shows the average daily UV index in December in Cornwall, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in December in Cornwall Over the Years
This chart shows the average temperature in December in Cornwall, measured in degrees Celsius, over the past years.
Total Precipitation in December in Cornwall Over the Years
This chart shows the average precipitation in December in Cornwall, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in December for Cornwall
Click on a specific day in December for detailed info on the typical weather on that day in Cornwall. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in Cornwall
Have you been to Cornwall in December?
Share your weather experience in December in Cornwall.
Average Weather in Cornwall by Month
Click on a month below to see detailed weather info for Cornwall. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
